Automatic pressure and vacuum device



ug. i9, 1924. 1,505,695

T. H. BOYD AUTOMATIC PRESSURE AND VACUUM DEVICE Filed may 12, 1923 gwLmmTo/a @Hoz egg U ITED STAT ES,

-isea6e5 PATENT v`()FFICIE"..

THOMAS H. BOYD, F OKLAHOMA CITY, OKLAHOMA, ASSIGNOR rTO JAMES J.' QARLES AND yILLIAWI E. AARON, BOTH OF PAWHUSKA, OKLAHOMA, COLPARTNERS.

TRADING AS GAS-'RITE DEVICE COMPANY.' i l AUTOMATIC PRESSURE ann vacuum nevica.

Appiiauon mea May 12, 192s. serial no. 638,576.

"M .T0 allzu/omit may concern: y y

Be it known that I, THoMAs H. Born,

a citizen of the United States, residing at Oklahoma City, in. the county of Okla- '5 homa and State of Oklahoma, have invented certain new and usefuly Improvements in Automatic Pressure and'Vacuum Devices, of Which the following is a specification.

The present inventionhas reference'to an automaticpressure and vacuum device for use on any and all containers of liquids of various `kinds but more especially constructed for `use on tanks or containers in which are carried or storedfiuids contain` ing vapors or gas, such as crude orl refined oil and gasolene. ,f f y y 'y y The invention is designed" primarily for the purpose of maintaining a predetermined pressure in the tank or container ofsuin-y cient amount to retain thevapors, thereby increasing or retainingthe qualityl of the Huid and reducing the'` evaporationV loss 4to a minimum and* is so constructed that it functions either to relieve they tankof ex-r cess pressure or to .admitair into the tank to lill the volume of space vacated bythe liquid when the same is being ldischarged or drawn from the tank, the valves of the device `opening and closing automatically and Without the human element ,ofl service entering into their operation, thereby eliminating all danger of blovvingup, bursting or collapsing of the tank Vory container on which the device isinstalled.,y o k The invention further provides a pressure and vacuum regulatingl device ofthe character set forth which is of rgenerallylimproved construction and desigmmaking the device very easy and economicalto cast and machine and embodying, among other'novel and advantageous improvements, a one-piece body casting having removable valve as,- semblies and fire-arresting` means ,together With` a dirt-and-moisture excluding cover and an automatic drainage feature. v v

With the above and other objectsin view, the invention consists essentially in the novel construction and combination of'parts hereinafter more fully described Vand explained, reference being had'to the accompanying drawing illustrating the invention, wherein.:

Figure 1 is an assembled view of the device with the'partssbown .vertical secn` tion, and 1 3 Figure 2 is a section .thru kthe body casting taken along line 2-2 of Figure 1.

The device is constructed of a one-piece bodycasting 10 enclosing the various chambersand provided With an internally thread-y ed opening 11 at the extreme bottom for the purpose of attaching the device to the tank or-.other container on which it may be used. The device is attached to tank'by means ofa short length ofpipe screwed to bottom of casting and into flange secured to the tankgg j The opening 11 is the inlet'th'ru which the chamber l2 of the casting receives vrthe pres-y sureof the` tankandjabove this ,chamber is llocated'the pressure exhaust lchamber' 13 in the bottom vvall 14 of' which is provided an internally threaded port 15. rExhaust chamber `13 ris openfltolthe atmosphere at 'its upper"endas shown, andlis equipped with a removable `valve 'assembly including apressure v alve 16 for automatically openingand closing port 15. Disposed `laterally `of the mainv or pressure `receiving chamber 12 is an airintake chamber 17 having an internallythreaded port 18 and being in constant communication With` .chamber 12' byvvayof passage 19. Chamber 17 is also provided With a removable valve assembly; the same Iincludinga vacuum valve 20 for controlling the port 18.A Chambers 13 and 17 are each provided Witha suitable number of y, ribs 21,y preferably, four, 'toy actl as guides forthe pressure 'valve 16' and 'vacuum valve 30, respectively.; These ribs are cast integralvvith the body 'casting and have stops 22 at theirupper ends for limiting the `extent kof, valveopening movement, Which stops-maybe formed by undercutting the'ribs as shown. s v

" The "valve lof each assembly ysupported on a valve seat 23 and has an integral depending portion 24 cast hollowl and cone shapedjwith openings 25 in the sides to permitthe vfree flow of gas yor air/to the bottompf the valve., The valve cone de.- pends into the valve seat which is made cylindricalto permit the freemovement of f the cone at any angle therebyinsuring]- h turnjofthe valveto a perfect seat.

haust chamber andr intake chamber",y respecseatis, moreover, equipped with an exte- 105 tively, and with a locking collar 27 yfor abutment with the body casting to perfect CII an air-tight joint without the use of gaskets. n the body casting, directly over the vacuum valve 20, is an opening 28 for the purpose of attaching an instrument, such as a manometer, to determine the eXactamount of pressure or vacuum under which the valves are functioning. rlhe valves can be constructed to act at any desired amount v of pressure and the opening 28 provides convenient means for ascertaining if the valves act at the pressure intended. Being removable and of similar construction, the valves are interchangeable and can be readily removed or replacedby applying ya wrench tothewrench lugs 29 of the seats.y

In the operation or the device the valves open and close automatically. YAs vthe fluid retain the vapors and the quality of the fluid, thereby'reduc'ing the evaporation loss' to the minimum; A When the fluid is being discharged er withdrawn from the tankv a vacuum i's created within chambers 12 and 17. This vacuum, whichordinarily hinders or prevents the y,tree discharge of the fluid,

is broken bythe admission of air into the f device 'thru' port 18; the valve 20 being opened automatically bythe outside atmosplieric pressure. The highest point at which either valve can raise under pressure will not allow lower or cone shaped part of valve to go above seat, thereby insuring return of valve to the seat. l At the extreme top of the body casting and directly vover the upper open end of the exhaust chambe'rl so as to be above the pressure valve 16 is a cover 30 having vslopf ing sides for shedding rain or moisture and for preventing dust yor dirt from being deposited in or around the valve. Cast integral with 'the bodyv lcasting is a drainage chamber 31 having its upper end. in cominunicatio'n with the exhaust chamber'l 'so as to insure the drainage o f any Ainoisture "that might be formed by condensation or by' rain or sncvv blowing under ecver SO-andtending'te clog or freeze the valve.l 'The drain- 'age chamber is, of course, open at its lower end and thus provides tchathe convenient auterh'aticdrainage er the device. y y integrally connected to' the cover 30 by means .ci sh'rt depending lugs sa is e dat yand the. open end or Vthe exhaust chamber.

The gauze acts as a tire arrestor for preventing ire from entering the device in the event of the escaping gas becoming ignited. A cup-shaped screen, including a wire gauze 36 and a retaining ring 37, is provided for a similar purpose at the bottom opening of the drainage chamber; the ring lbeing screwed in a; threaded counterbore of the chamber, as shown.

It will thus be seenthat the device is beth iirep'roof and dripproof and that it is capable of being readily assembled cr taken apart ferrepairs or inspection Whenever de sited. lMorettarer, the ycpeijii'ngs of the body casting are parallel to each other, making the saine easy to cast and'm'achine. Valves and valve seats are to be made yfrom Ina--v terials not subject to corrosion or decay by atmosphere, or by any or the dilierent fluids o r gases that might be. passed through the device.

Y From the foregoingv it is thought that the 7i construction and operation of the device will be readily understood and it is to be noted, in this coiinection,` that the invention `further embodies all such changes and refinements in construction, design, etc., as are properly within the purview of the invention defined in the appended claims.

Having thus described the invention, what is `claimed as new and desired to be secured by Letters Patent is: Y

1. An automatic pressure and vacuum device comprising a pressure-receiving "chamL ber, an air intake chamber communicating therewith, a pressure-exhaust chamber above the receiving chamber open at its upper end, valve means in the intake chamber operable to admit Vair into the receiving chamber, valve means in the exhaust 4chamber oper able to permit escape of excess pressure from the receiving'chamber, 'a wire gauze span-v ning the upper open end of the exhaust chamber, and a dirt-'andmcisture excluding cover having arsupp'orting ring engageable with said chamber for supporting the cover in raised position thereover, said ring. also serving as a retainer for the said gauze.

l 2. An automatic pressure and vacuum devceceinptising' a body 4portion having ven tically aligned pressureaeceiving and pres;- si'tteeihausting chambers respective-ly, -said pressure-receiving ychamber having anan'xil- 'iary intake chamber and said preseure-ex-` hausting chamber having a drainage chainber, a cover mounted on the bodyv portion in raised position above the upper open end of the exhaust chamber, a nre-arresting screen removably engaged betweenthe Cover and the open end of the exhaust Chamber,

and a fire-arresting screen removably engaged in the outer end of the drainage ohamber.

3. In an automatic pressure yand vacuum device, a one-'piece casting having a main or pressure-receiving chamber, any exhaust chamber positioned above they receiving chamber, a chamber disposed laterally of one side of the receiving chamber' and providing an air-intake chamber, ya chamber disposed l laterally of the opposite side of the yreceiving chamber and providing a drainage ehamo ber for the said exhaust chamber, a retaining ber supporting a Cover for the said chamber,

and Wire gauze between each retaining ring f and chamber.

In testimony Whereofl aiiix my signature.

THOMAS H. BOYD. 

